Nov 17, 2011 SiPM Electrical and Cooling

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Action Items from previous meetings

  1. Jack to update board with bias compensation circuitry (Jack)
  2. Check on status of shipping of bcal slices (Elton)
  3. Elton to send monitoring specification to Jim.
  4. Confirm the number of wires in the Fisher bias connector to the board. Jim will send Fernando the precise connector number.

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Schedule, reporting, and manpower (Elton)
  4. SiPM production testing (everyone)
    1. Light source / optics
    2. Electronic boards
    3. Cabling
    4. Cooling plate
    5. Programming
    6. Other?
  5. SiPM testing (Ivan)
  6. Mechanical assembly (Scot)
  7. Mechanical (Jim)
  8. Mechanical drawings (Chuck)
  9. Temperature compensation (Jack)
  10. Preamp-summing (Fernando)

Minutes

Attending: Scot, Yi, Elton, Ivan, Fernando, Jim, Carl, Chris, Tom, Eugene

  1. Announcements
  2. Action Items
  3. Schedule, reporting, and manpower (Elton)
    • No updates
  4. SiPM production testing (everyone)
    1. Light source / optics
      • Carl is testing the uniformity of illumination. Good uniformity horizontally. Vertically there is some variation of a few % and may need to be calibrated separately.
    2. Electronic boards
      • Essentially all ordered. Expect deliveries soon after Thanksgiving.
    3. Cabling
    4. Cooling plate
    5. Programming (Yi)
      • Yi gave a demonstration of the new log book setup. It uses the JLab username and password, but one must register.
      • Hall D e-log
    6. Other?
  5. SiPM testing (Ivan)
    • The DAQ has been hooked up to the setup and first timing measurements have been completed
    • For the 25 micron at 1400 pixel pulses, 180 ps for 100 Hz to 5 MHz.
    • For the 50 micron at 2000 pixel pulses, 280 ps up to 2.5 MHz.
    • Setup includes reading Flash ADCs and TDCs for two SiPMs and the reference pmt.
    • Eugene: Suggest checking the intrinsic timing resolution of the electronics setup.
    • Discussion regarding the high rate tests reported last week showing that the device draws about 400 microA from the bias supply at 10 MHz. This is consistent with pulses of 1000 pixels and gain of 10^6.
  6. Mechanical assembly (Scot)
    • Received four Bcal slices today
    • Ran copper tubing through the labyrinth of the dark box
    • Moved chiller over to EEL
    • Received optical parts and mounting for cooling plate and has them installed
    • Received meter for temperature sensor and wired it up
    • Adaptor for syringe on expedited order, but no delivery date yet
    • Elton: Suggest test of temperature cycling of gluing tests (5 to 50 deg C). Eugene: There is an oven in the EEL over near the Hall A area which might be borrowed.
    • Eugene: Reminder also to check any adverse effects of glues on the lead
    • Four more glues to check out
    • New UV source for gluing is in. Scot has checked with Dick Owen whether an OSP is needed. Dick checked light levels and will evaluate the need.
  7. Mechanical (Jim)
    • So far only one minor error found on the readout pieces. Mounting screw hole had to be resized, and has been corrected in model.
    • Ordered second bcal readout set from First cut. Estimated delivery is end of the month.
    • Will get the al pieces black iodized to avoid reflections.
    • All parts from the machine shop are in
    • Bill of materials has been extracted from the 3D model into an excel file to order remaining parts early next week
    • Also working on the tooling for the light guides. Will shortly put it into the cad system.
  8. Mechanical drawings (Chuck)
  9. Temperature compensation (Jack)
    • We have not received any update from Jack on updating the bias compensation circuitry.
    • Fernando has suggested a distribution of bias voltages for equal loading. See table below.
  10. Preamp-summing (Chris and Fernando)
    • Chris passed around the small board with Lemo connectors and the thermistor board.


Assignment of bias to channels
Channels Bias
37 38 39 40 Vbias 4
33 34 35 36 Vbias 3
29 30 31 32 Vbias 2
25 26 27 28 Vbias 1
21 22 23 24 Vbias 4
17 18 19 20 Vbias 3
13 14 15 16 Vbias 2
09 10 11 12 Vbias 1
05 06 07 08 Vbias 3 (05 and 06) Vbias 4 (07 and 08)
01 02 03 04 Vbias 1 (01 and 02) Vbias 2 (03 and 04)
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